package controller;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.Blog;
import model.BlogDao;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/authorInfo")
public class AuthorServlet extends HttpServlet {
    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("application/json;charset=utf8");
        //通过这个方法，获取到指定的博客的作者信息
        String param = req.getParameter("blogId");
        if (param == null || "".equals(param)) {
            //参数缺失
            resp.getWriter().write("{\"ok\": false, \"reason\": \"参数缺失！\"}");
            return;
        }
        //参数不缺失
        //根据当前的blogId在数据库中查找对应的blog，获取到blog对象，再进一步根据blog对象，找到作者信息
        BlogDao blogDao = new BlogDao();
        Blog blog = blogDao.selectOne(Integer.parseInt(param));
        if (blog == null) {
            resp.getWriter().write("{\"ok\": false, \"reason\": \"参数缺失\"}");
            return;
        }

        //根据blog对象，查询到用户对象
        UserDao userDao = new UserDao();
        User author = userDao.selectById(blog.getUserId());
        if (author == null) {
            resp.getWriter().write("{\"ok\": false, \"reason\": \"查询用户不存在！\"}");
            return;
        }

        //把author返回到浏览器(user对象写成json格式)
        //把密码给去掉
        author.setPassword("");
        resp.getWriter().write(objectMapper.writeValueAsString(author));

    }
}
